[Sbs] SBS GEp Abstract for APS DNP in October in N.N. - version 2

[Evaristo Cisbani]

Dear All,

attached the second draft of the abstract that takes into account
corrections and suggestions from Charles, Seamus, Brian and Mahbub; the
new version has <1300 chars.

Additional comments are welcome.

Thanks in advance 

Best,
Evaristo


-- 
 Evaristo Cisbani                      office : +39 06 4990 2847 
 Istituto Superiore di Sanita`         lab    : +39 06 4990 2347
 Department of Technology and Health   fax    : +39 06 4990 2137 
 and Istituto Nazionale di Fisica Nucleare Roma - gruppo Sanita`
 via Regina Elena 299 - 00161 Rome     web    : www.iss.infn.it/cisbani
 Italy
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Title: Large acceptance magnetic spectrometer for the 12 GeV2 GEp experiment

Authors: @@@ GEp spokespeople ? suggestion very welcome @@@

GEp5 is the latest of a series of successful JLab experiments 
 that have measured a linear decrease of the electromagnetic proton form factor ratio GE/GM 
with Q2, changing our view of the mechanism of the electron scattering.
GEp5 will extend the previous GE/GM measurements to higher Q2 where a possible
deviations from linearity could be expected; data can be compared with expectations 
from perturbative QCD and can give new hints on the role of
quark orbital angular momentum.

To compensate for the large drop of the elastic cross section with Q2, 
GEp5 needs to run at the highest beam polarization and luminosity, 
with large acceptance detectors and a high efficiency proton polarimeter.
These requirements are fulfilled by the development of a new liquid hydrogen target and 
the new Super Bigbite Spectrometer (SBS).
SBS will use a conventional setup with state of the art detectors:
an existing dipole magnet (field integral $\le 2$ Tm)
will be properly adapted to reach forward scattering angles; 
large Gaseous Electron Multiplier (GEM) chambers
will be used as trackers for both the primary proton and the scattered secondary in the polarimeter.
A new shashlik calorimeter with high segmentation will likely complete the detector setup.

Details will be presented at the meeting.

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